While population estimates are difficult in the dense forest, there are thought to be 6,500 - 7,500 orangutans in Sumatra and 12,000 - 13,000 in Borneo. It is listed as an endangered species by the U.S. Fish and Wildlife Service and the IUCN Red Data Book and is an Appendix1 species under CITES.One project in Tanjung Puting National Park in Borneo rehabilitates orangutans confiscated from smugglers or private owners and returns them to the forest.
Orangutan Foundation
The Balikpapan Orangutan Society
Orangutans: Just hangin' on